Blowpipe



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m ff INVENTOR. Owen R R/ce O. R. RICE Dec. 7, 1937.

BLOWPIPE Filed March 14, i955 A IU INVENTOR.

Dec. 7, 1937.

BLOWPIPE Filed March 14, 1935 2 Sheets-Sheet 2 Owe/7 /ce Patented Dec. 7, 1937 UNITED STATES PATENT OFFICE BLOWPIPE tion of Maine Application March 14, 1935, Serial No. 11,005

17 Claims.

The present invention relates to improvements in blow pipes.

More particularly the present invention relates to pipes such as are used in connection with blast furnaces for con-ducting the hot blast from the bustle pipe to the tuyre. Ordinarily blow pipes used for this purpose are made of cast iron or cast steel and are not insulated, whereas the rest of the system is lined with re brick, which has certain insulating Value, though in some instances the blow pipes of a blast furnace installation have also been lined with fire brick. However, a blow pipe is subjected at times to violent mechanical handling, particularly when it is being moved, as for example when a tuyre is changed. Such mechanical violence dislodges the brick lining. Moreover, it happens not infrequently that molten. slag and/or iron runs back into the blow pipe due to certain irregular conditions within the furnace or to faulty Ymanipulation of the blast control. With an iron pipe which is bare interiorly it is usually possible to rod out the slag or iron which has chilled and partially lled the pipe. If this is only a superficial filling at the bottom of the pipe, the rodding out can be accomplished with the pipe in place and even with the blast on. In case of a brick lined pipe, however, the slag or iron will so cling to the brick as to make its removal impossible without destroying the brick. v

An object of the present invention is to provide an insulated blow pipe in which insulating material oi high efliciency may be used and in which said insulating material is protected against contact with slag or, iron and also from the blast.

A further object is to provide an insulated blow pipe of high eiciency in which any slag or iron which may collect therein may be readily rodded out.

A further object is to provide an insulated blow pipe in which the principal structural member is protected from the heat and operates at substantially lower temperature than the air blast.

A further object is to provide an insulated blow pipe in which the principal structural member is the exterior member and the insulation and the members exposed to heat are mechanically protected internal members.

A further object is to provide an insulated blow pipe which is simple to manufacture and which may be made at a relatively low cost.

A further object is to provide a blow pipe well adapted to meet the needs of commercial operation. v

(Cl. 13S-63) Further objects will appear as the description proceeds.

Referring to the drawings:

Figure l is a view in side elevation, parts being broken away, illustrating a blow pipe embodying the principles of the present invention;

Figure 2 shows a 4detail of construction, the parts being separated for simplicity of disclosure;

Figure 3 is a View similar to Figure 1 but illustrating another embodiment of the present invention which will probably be preferred by some;

Figure 4 is a sectional view taken along the plane indicated by the arrows 4-4 of Figure 3;

Figure 5 shows a detail of construction; and 15 Figure 6 illustrates a detail of another modication,

Referring rst to Figures 1 and 2, the numeral I0 indicates a pipe casing having the inturned annular portion I I at one end thereof, which annular end portion provides the aperture I2 through which a hot blast oi air may be directed to the tuyre of a blast furnace. The other end of the pipe casing I0 is internally screw-threaded for the reception of an externally threaded ring I3, the purpose of which will be referred to presently. Disposed in coaxial relationship with the pipe casing Ii) is a cylindrical assembly, indicated as a whole by the numeral I4, which assembly is made up of the rings IE--IS which are disposed end for end to provide said assembly Ill. The rings I5--I5 will be similar in size and contour, but one of them may be a short ring chosen of a length to make the assembly I4 correspond to the length of the pipe casing I0. The assembly Ill of sai-d rings l5 is held in place at one end against the adjacent surface of the inturned portion I i of the pipe casing lil and at the other end by means of the threaded ring i3. The rings I5 may be chosen of a material which has ability to withstand high temperatures without severe deterioration.

The rings I5 are jointed to each other and to the inturned end portion II by means of pipe joints, which are illustrated in Figure 2. It will be noted that the material at one end of each ring I5 is thickened radially and is grooved, as indicate-d by the numeral I6, to receive the adjacent beveled edge I I of the neighboring ring I5 or the beveled annular projection I 2 of the portion II. The surface of contact axially of the assembly I4 between the beveled end I'I and the adjacent groove I6 is inclined in a direction toward the end portion I I'of the pipe casing, which is the end which communicates with the tuyre.

According to the preferred construction, the material of the thickened end of each ring I5 should Y construction, a rod or chisel bar can be thrustV into the ring assembly I4 from the stock end of the blow pipe, whereby iron or slag deposited within said assembly may be cleaned out without fouling the joints between the rings I5-I5.

Surrounding the rings I5 is a packing of insu- Y lating material, indicated by the numeral 2li. This insulating material may be chosen for its efficiency as an insulator, it being unnecessary to choose insulating material which is of itself capable of withstanding-shocks or rough usage. Annular members 2I-2I are provided Vbetween the inner surface of the pipe casing I and the thickened extremities of each of the rings I-I5 for the purpose of holding the ring assembly in its proper coaxial position within said pipe casing.

A preferred method of assembly of the structure disclosed in Figures 1 Yand 2 is as follows. The pipe sleeve I0 is disposed in a vertical position with the tuyre end thereof downward. The first sleeve I5 is mounted in place and the insulating material Lis placed between said first sleeve I5 and the pipe casing I0. When the space within the first ring I5 has been lled with insulating material, Vthe next ring I5 is lowered into place in jointed relationship with the rst ring I5. An annular member 2| is then dropped into place between the thickened end portion of said second ring YI 5 and the inner wall of the pipe casing I0. The next filling of insulation is applied in the'sarne manner, and the sleeves, insulating material and annular members are progressively mounted in position until the blow pipe is assembled up to the stock end. Said annular members 2I act as struts to hold the ring assembly I4 against radial displacement relative to the pipe casing I0.

The screw-threaded ring I3 is provided with a groove 22 facing toward the tuyre end of the blow pipe adapted to receive and hold the Yadjacent end of the ring I5. Preferably a space is left in said annular groove 22 to allow for expansion of .the ring assembly I4.

Referring now to the construction illustrated in Figures 3, 4 and 5, the pipe casing Ia takes a slightly different form from that illustrated in Figure 1. In the structure shown in Figures 3, 4, and 5, the arrangement and the form of the rings I5-I5 is modified and another form of abutting means for holding the rings in coaxial relationship with the casing Illa is illustrated. In Figure 3 a slight modification is illustrated in the means for holding the rings in position axially of the device.

In the construction shown in Figures 3, 4, and 5 the casing Ia is provided at the tuyre end of the blow pipe with the inturned annular portion I la, which annular portion provides an aperture through which a hot blast of air may be directed through the tuyre of the blast furnace. The other end of the pipe casing ma is provided with the ring I3a, which fits within the pipe casing Ia and may be spot-welded to said pipe casing for the purpose of positioning the'rings, which will nowbe described.

The numerals I5a-I 5a indicate rings or sleeves arranged end for end coaxially with respect to the pipe casing Ia, said rings VIla--I5a being identicai in contour except that one of said rings may be shorter than the others, whereby the length of the ring assembly may be chosen to correspond to any particular length of pipe casing. The assembly of the rings I5a is held in place at the tuyre end of the pipe casing Ia against the adjacent surface of the inturned portion IIa of said pipe casing, and the other end of said ring assembly is held in place by means of the ring I3a.

The rings I5a are jointed to each other and to the end portion I I by means of pipe joints, which are illustrated on an enlarged scale in Figure 5. According to the structure illustrated in Figures 3 and 5, the material at one end of each ring la is thickened radially as indicated by the numeral Ida and is grooved internally. The other extremity of each of the rings I5a is of slightly less diameter than the diameter of the adjacent portion of its neighboring ring I5a, Likewise the ring a at the tuyre end of the blow pipe is of slightly less diameter than the adjacent portion Vof the inturned end I I of the pipe casing Illa.

The detailed View appearing in Figure 5 indicates the overlap at the tuyre end of each ring Ia and its neighboring ring and the overlap between the ring I5a at the tuyre end of the blow pipe and the adjacent portion of the inturned end IIa of the pipe casing Ila. Said overlap is indicated by the numeral ISU..

According to the structure illustrated in Figures 3 to 5, the means for holding the ring assembly I5a-I5a in coaxial relationship with the pipe casing loa, is embodied in a plurality of bosses or lugs 2Ia-2Ia, which are disposed in abutting relationship with the thickened end portions of the rings or sleeves I5a-I 5a. Figure 4 illustrates three of these lugs or bosses 2 Ia disposed substantially symmetrically around the inner circumferference of the pipe casing Ia. In the construction shown in Figures 3 to 5, said bosses or lugs 2 Ia are formed integrally with the pipe casing Illa.

The ring assembly Ilia-ld is held in position longitudinally of the blow pipe by means of the ring i3d, which ring on the side thereof facing toward the tuyre end of the blow pipe is provided with the groove 22a, which is adapted to receive and hold the adjacent end of the neighboring ring I5a. As in the construction illustrated in Figures 1 and 2, a space is preferably left in said annular groove 22a to allow for eX- pansion of the ring assembly I5a-I5a.

Figure 6 illustrates another modication in which a sleeve I5b is provided which may be a unitary sleeve extending from one end to the other of the pipe casing Ilia. Said sleeve |511 may be made up as preferred, a construction which is practical and feasible being to form a strip of suitable material into a tube providing a closed or a substantially closed sleeve from end to end. United to the exterior surface of the ring I5b is an abutment member indicated by the numeral 2lb which may take the form of a ring, if preferred, extending around the periphery of the sleeve I5b or may take the form of a plurality of bosses or lugs disposed peripherally with respect to the sleeve |51).

It will be understood of course that the details of construction from the three illustrated forms of the invention may vbe chosen as preferred in making up'an assembly as, for example, the

abutment means 2lb of Figure 6 may be Yem- A'bodied in either of the other two embodiments of the invention. I

In theconstruction illustrated in Figure 6 it is practicable and feasible to build up the insulating material 2l] upon a sleeve before said sleeve is placed in the pipe casing, any preferred means being used to hold said insulating material in place temporarily while the assembly is being slid into position. r the insulating material may be omitted altogether, the air space alone serving as the insulating means.

I'he blow pipe above described has the advantage that'it may be readily assembled and is well adapted to withstand stresses to which it may be subjected. Moreover said blow pipe is a self-contained unit with the lining definitely held in place at both ends. The insulating material 26 may be chosen as desired without regard to its resistance to the effect of slag or iron. The rings l5 and l5a or the sleeve |51) may be chosen of an alloy which will resist the high temperature of the hot blast passing through it. By reason of the overlap I9 on each of the sleeves I5 and I5a, any deposit of slag or iron may be rodded out without danger of fouling the joints between said rings I5-l5, or between the rings iSd-15a, or between the tuyre end of the blow pipe and its neighboring ring. By reason of the conical surface comprising the surface of contact between the rings, as disclosed in Figures 1 and 2, which conical surface tapers toward the tuyre end of the blow pipe, there will be very little tendency to push slag or iron into the space between the ring assembly and the pipe casing when the ring assembly is being rodded out. Though it is preferred to use the heat insulating material in the space between the ring assembly and the pipe casing, certain advantages of the invention may be attained without the use of said insulating material.

The present invention provides a structure in which the part of the blow pipe which provides structural strength, that is-the principal structural member, is insulated from the hot blast. This construction has the Itwo-fold advantage that (a) the stress-resisting member is never the hottest part of the blow pipe and therefore is able to preserve its strength-providing func-tions unimpaired by extra high temperatures, and (b) the exterior of the blow pipe, being rugged, is well adapted to withstand the shocks to which blow pipes are commonly subjected when changes must be made in or about the tuyre with which the blow pipe is associated.

Though a preferred embodiment of the present invention has been described in detail, many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims.

What is claimed is:

1. In a blow pipe for blast furnaces, in combination, a pipe casing and a ring assembly within said casing, said ring assembly comprising a plurality of rings disposed end for end coaxially relative to said casing, each of said rings having Yan inwardly flaring end portion of less diameter than the remainder of said ring, most of said rings at their other ends having an annular shoulder for receiving and encircling the first mentioned end of an adjacent ring whereby said assembly may be cleaned out Without fouling the joints between adjacent rings, and insulating material between said ring assembly and said casing, said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

2. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end and abutting longitudinally against said end portion of said pipe casing, and means a-t the other end of said pipe casing for holding said ring assembly relati-ve to said pipe casing, said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

3. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end and abutting longitudinally against said end portion of said pipe casing, means at the other end of said pipe casing for holding said ring assembly relative to said pipe casing, and insulating material between said ring assembly and said pipe casing, said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

4. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of of rings jointed together end for end and abutting longitudinally against said end portion of said pipe casing, means at the other end of said pipe casing for holding said ring assembly relative to said pipe casing, and annular struts disposed within said pipe casing and having abutting relationship with said rings for holding said ring assembly in xed relationship to said pipe casing said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

5. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end and abutting longitudinally against said end portion of said pipe casing, means at the other end of said pipe casing for holding said ring assembly relative to said pipe casing, annular struts disposed within said pipe casing and having abutting relationship with said rings for holding said ring assembly in fixed relationship to said pipe casing, and insulating material between said pipe casing and said ring assembly said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

6. In a blow pipe for blast furnaces, in combination,I a pipe casing and a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end, the inner periphery of each of said rings at the end thereof adjacent to the outlet of said blow pipe being flared inwardly and having overlapping relationshipl with the adjacent end of its neighboring ring in a direction toward the axis of said ring assembly said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

'7. In a blow pipe for blast furnaces, in combination, a pipe casing and a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end, the inner periphery of each of said rings at the end thereof adjacent to the outlet of said blow pipe being flared inwardly and having overlapping relationship with the adjacent end of its neighboring ring in a direction toward the axis of said ring assembly, and means disposed at each end of said pipe casing for holding said ring assembly in a position substantially coaxially with said pipe casing said rings being of Y a material capable of resisting the high temperatures of a blast for blast furnaces.

8. In a blow pipe for blast furnaces, in combination, a pipe casing and a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end, the inner periphery of each of said rings at the end thereof adjacent to the outlet of said blow pipe having overlapping rela.- tionship with the adjacent end of its neighboring ring in a direction toward the axis of said ring assembly, means disposed at each end of said pipe casing for holding said ring assembly in a position substantially coaxially with said pipe casing,

and peripherally distributed means disposed outwardly of said rings and inwardly of said pipe casing for holding said ring assembly in substantially coaxial relationship with said pipe casing said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces. Y Y

9. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality ofY rings jointed together end for end and jointed to said end portion of said pipe casing, means at the other end of said pipe casing for holding said ring assembly relative to saidpipe casing while permitting expansion of saidring assembly relative to said pipe casing and peripherally distributed means disposed outwardly of said rings and inwardly of said pipe casing for holding said ring assembly in substantially coaxial relationship with said pipe casing said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

10. In a blow pipe for blast furnaces, in combination, a principal structural member comprising a pipe casing, a sleeve coaxially disposed within said casing, said sleeve being jointed to said pipe casing adjacent to the outlet end thereof and means carried by said. casing at a region spaced from said outlet end and jointed to said sleeve for holding said sleeve in coaxial relationship with said pipe casing and insulating material between said sleeve and said pipe casing.

11. In a blow pipe for blast furnaces, in combination, a principal structural member comprising a pipe casing, a sleeve within said casing, means disposed peripherally with respect to said sleeve for holding said sleeve in coaxial relationship with said pipe casing said sleeve being of a material capable of resisting the high temperatures of a blast for blast furnaces, and insulating material between said pipe casing and said sleeve, said sleeve including layers disposed edgewise relative to each other.

12. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, saidV pipe casing comprising the principal structural member of said blow pipe, a sleeve coaxially disposed within said pipe casing, means at the other end of said pipe casing for holding said sleeve relative to said pipe casing while permitting eX- pansion or contraction of said sleeve relative to said pipe casing and peripherally disposed abutment means for holding mid-portions of said sleeve in coaxial relationship with said pipe casingsaid rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

13. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a ring assembly coaxially disposed within said pipe casing, said ring assembly comprising a plurality of rings jointed together end for end and jointed to said end portion of said pipe casing, means at the other end of said pipe casing for holding said ring assembly relative to said pipe casing while permitting expansion or contraction of said sleeve relative to said pipecasing, and abutment means disposed within said-pipe casing and having abutting relationship with said rings, said abutment means being Vdisposed peripherally with respect to said ring assembly for holding said ring assembly in coaxial` relationship, with said pipe casing said rings being of a material capable of resisting the high temperatures of a blast for blast furnaces.

14. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a sleeve coaxially disposed within said pipe casing, said sleeve having abutting relationship longitudinally against said end portion and having its internal diameter adjacent to said end portion less than the internal diameter of said end portion said sleeve being of a material capable of resisting the high temperatures of a blast for blast furnaces.

15. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a sleeve coaxially disposed within said pipe casing and abutting against said end portion, means at the other end of said pipe casing for holding said sleeve relative to said pipe casing while permitting expansion or contraction of said sleeve relative to said pipe casing and insulating material between said pipe casing and said sleeve said sleeve being of a material capable of resisting the high temperatures of a blast for blast furnaces.

16. In a blow pipe for blast furnaces, in combination, a pipe casing having an end portion, a sleeve coaxially disposed within said pipe casing and abutting against said end portion, means at the other endV of said pipe casing for holding said sleeve relative to said pipe casing and means disposed outwardly of said sleeve and inwardly of said pipe casing for holding mid-portions of said sleeve in substantially coaxial relationship with said pipe casing said sleeve being of a material capable of resisting the high temperatures of a biast for blast furnaces.

17. In a blow pipe, in combination, a principal structural member comprising a pipe casing, a sleeve within said casing, means disposed peripherally with respect to said sleeve for holding said sleeve in coaxial relationship with said pipe casing, and insulating material between said pipe casing and said sleeve, said sleeve comprising a strip of material formed into a tube.

OWEN R. RICE.

CERTIFICATE OF CORRECTION.. i Patent No. 2,101,270. Deoemer T, 1957.5.

OWEN R. RICE.

It is hereby certified'that error appears in the printed specification of the above'nmbere'd patent requiring correction asfollow's; Page 5, second columrg` line 50, claim M ,strike out the word "of-"g page h, first column,

lines 66, 67 and 68, claim l2, strike out thewords and comma "said pipe f casing comprising the principal structural member of'said blow pipe and insert the saine after the word and commaportion," in second column, line 29, claim lli; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case 1n the Patent office.l

Signed and Sealed this 22nd day of February, A. D. 1958.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents. 

